From: Kent (cciecn@xxxxxxxxx)
Date: Tue Feb 29 2000 - 16:36:42 GMT-3
I remember somewhere I read this, but can not recall
where, the clock rate definitely has somethingh to do
with the length of the cable, the longer the lower
clock rate we should use. I remember there is a table,
somebody can find it?
Thanks
Kent
--- Richard Wagner <Richard.Wagner@mitchell.com>
wrote:
> If I read that as a test requirement, I would
> interpret it as "as high as
> practically possible". Being aware of the highest
> data rates supported by
> RS-232 and V.35 and setting for those rates would
> likely suffice. Since
> you're running back-to-back, your only risk is
> out-of-spec hardware and/or
> cabling.
>
> These may be "famous last words"... I would not
> expect a situation where
> you would be given substandard equipment and be
> forced to determine a slower
> clock rate while reviewing port statistics for
> errors.
>
> If you're worried about it at all, set it to the
> highest available per the
> specification. Then you can run a lot of traffic
> (big pings) across it and
> look at the port statistics.
>
> -----Original Message-----
> From: Price, Jamie [mailto:jprice@isgteam.com]
> Sent: Tuesday, February 29, 2000 9:21 AM
> To: 'ccielab@groupstudy.com'
> Subject: Phase Shift
>
>
>
> "Choose the highest clock rate available without
> inducing Phase Shift or
> other line errors"
>
> This is a configuration requirement in a test lab
> that I have. I have
> searched for a definition of "Phase Shift" but am at
> a loss. If there is
> someone out there that can explain what it is (or at
> least point me to where
> I can find out) it would be much appreciated. I
> would like to find out
> exactly what Phase Shift is, what clock rates fall
> within the spectrum of
> not inducing this mysterious occurence, is the Phase
> Shift/clock rate
> relationship dependant on the cable type in use,
> etc.
>
> In a lab environment I have just been using 56000 or
> 115200 as a clock rate
> - no problems. Come CCIE lab day however, should a
> line like this appear in
> the config then I would don't want to run the risk
> of losing even a single
> point for something as simple as a required clock
> rate (even though I dont
> know what Phase Shift means) because I set it too
> high meet the requirement.
>
> Thanks in advance
>
> Jamie
>
>
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